soc/intel/quark/gpio_i2c.c: Use __func__

Change-Id: Id84a88933d32f60dd8d864d9a10d84a2b3c365ff
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/49563
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by:  Felix Singer <felixsinger@posteo.net>
Reviewed-by: Michael Niewöhner <foss@mniewoehner.de>

src/soc/intel/quark/gpio_i2c.c

@@ -12,7 +12,7 @@
 __weak void mainboard_gpio_i2c_init(struct device *dev)
 {
 	/* Initialize any of the GPIOs or I2C devices */
-	printk(BIOS_SPEW, "WEAK; mainboard_gpio_i2c_init\n");
+	printk(BIOS_SPEW, "WEAK; %s\n", __func__);
 }
 
 static struct device_operations device_ops = {